src/lttng-statedump-impl.c

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-statedump.c
   4  *
   5  * Linux Trace Toolkit Next Generation Kernel State Dump
   6  *
   7  * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
   8  * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Changes:
  11  *      Eric Clement:                   Add listing of network IP interface
  12  *      2006, 2007 Mathieu Desnoyers    Fix kernel threads
  13  *                                      Various updates
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/netlink.h>
  19 #include <linux/inet.h>
  20 #include <linux/ip.h>
  21 #include <linux/kthread.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irqnr.h>
  26 #include <linux/cpu.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/inetdevice.h>
  29 #include <linux/sched.h>
  30 #include <linux/mm.h>
  31 #include <linux/swap.h>
  32 #include <linux/wait.h>
  33 #include <linux/mutex.h>
  34 #include <linux/device.h>
  35
  36 #include <lttng/events.h>
  37 #include <lttng/tracer.h>
  38 #include <wrapper/irqdesc.h>
  39 #include <wrapper/fdtable.h>
  40 #include <wrapper/namespace.h>
  41 #include <wrapper/irq.h>
  42 #include <wrapper/tracepoint.h>
  43 #include <wrapper/genhd.h>
  44 #include <wrapper/file.h>
  45 #include <wrapper/fdtable.h>
  46
  47 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
  48 #include <linux/irq.h>
  49 #endif
  50
  51 /* Define the tracepoints, but do not build the probes */
  52 #define CREATE_TRACE_POINTS
  53 #define TRACE_INCLUDE_PATH instrumentation/events
  54 #define TRACE_INCLUDE_FILE lttng-statedump
  55 #define LTTNG_INSTRUMENTATION
  56 #include <instrumentation/events/lttng-statedump.h>
  57
  58 DEFINE_TRACE(lttng_statedump_block_device);
  59 DEFINE_TRACE(lttng_statedump_end);
  60 DEFINE_TRACE(lttng_statedump_interrupt);
  61 DEFINE_TRACE(lttng_statedump_file_descriptor);
  62 DEFINE_TRACE(lttng_statedump_start);
  63 DEFINE_TRACE(lttng_statedump_process_state);
  64 DEFINE_TRACE(lttng_statedump_process_pid_ns);
  65 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
  66 DEFINE_TRACE(lttng_statedump_process_cgroup_ns);
  67 #endif
  68 DEFINE_TRACE(lttng_statedump_process_ipc_ns);
  69 #ifndef LTTNG_MNT_NS_MISSING_HEADER
  70 DEFINE_TRACE(lttng_statedump_process_mnt_ns);
  71 #endif
  72 DEFINE_TRACE(lttng_statedump_process_net_ns);
  73 DEFINE_TRACE(lttng_statedump_process_user_ns);
  74 DEFINE_TRACE(lttng_statedump_process_uts_ns);
  75 DEFINE_TRACE(lttng_statedump_network_interface);
  76 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
  77 DEFINE_TRACE(lttng_statedump_cpu_topology);
  78 #endif
  79
  80 struct lttng_fd_ctx {
  81         char *page;
  82         struct lttng_session *session;
  83         struct files_struct *files;
  84 };
  85
  86 /*
  87  * Protected by the trace lock.
  88  */
  89 static struct delayed_work cpu_work[NR_CPUS];
  90 static DECLARE_WAIT_QUEUE_HEAD(statedump_wq);
  91 static atomic_t kernel_threads_to_run;
  92
  93 enum lttng_thread_type {
  94         LTTNG_USER_THREAD = 0,
  95         LTTNG_KERNEL_THREAD = 1,
  96 };
  97
  98 enum lttng_execution_mode {
  99         LTTNG_USER_MODE = 0,
 100         LTTNG_SYSCALL = 1,
 101         LTTNG_TRAP = 2,
 102         LTTNG_IRQ = 3,
 103         LTTNG_SOFTIRQ = 4,
 104         LTTNG_MODE_UNKNOWN = 5,
 105 };
 106
 107 enum lttng_execution_submode {
 108         LTTNG_NONE = 0,
 109         LTTNG_UNKNOWN = 1,
 110 };
 111
 112 enum lttng_process_status {
 113         LTTNG_UNNAMED = 0,
 114         LTTNG_WAIT_FORK = 1,
 115         LTTNG_WAIT_CPU = 2,
 116         LTTNG_EXIT = 3,
 117         LTTNG_ZOMBIE = 4,
 118         LTTNG_WAIT = 5,
 119         LTTNG_RUN = 6,
 120         LTTNG_DEAD = 7,
 121 };
 122
 123 static
 124 int lttng_enumerate_block_devices(struct lttng_session *session)
 125 {
 126         struct class *ptr_block_class;
 127         struct device_type *ptr_disk_type;
 128         struct class_dev_iter iter;
 129         struct device *dev;
 130
 131         ptr_block_class = wrapper_get_block_class();
 132         if (!ptr_block_class)
 133                 return -ENOSYS;
 134         ptr_disk_type = wrapper_get_disk_type();
 135         if (!ptr_disk_type) {
 136                 return -ENOSYS;
 137         }
 138         class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
 139         while ((dev = class_dev_iter_next(&iter))) {
 140                 struct disk_part_iter piter;
 141                 struct gendisk *disk = dev_to_disk(dev);
 142                 struct hd_struct *part;
 143
 144                 /*
 145                  * Don't show empty devices or things that have been
 146                  * suppressed
 147                  */
 148                 if (get_capacity(disk) == 0 ||
 149                     (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
 150                         continue;
 151
 152                 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
 153                 while ((part = disk_part_iter_next(&piter))) {
 154                         struct block_device bdev;
 155                         char name_buf[BDEVNAME_SIZE];
 156                         const char *p;
 157
 158                         /*
 159                          * Create a partial 'struct blockdevice' to use
 160                          * 'bdevname()' which is a simple wrapper over
 161                          * 'disk_name()' but has the honor to be EXPORT_SYMBOL.
 162                          */
 163                         bdev.bd_disk = disk;
 164                         bdev.bd_part = part;
 165
 166                         p = bdevname(&bdev, name_buf);
 167                         if (!p) {
 168                                 disk_part_iter_exit(&piter);
 169                                 class_dev_iter_exit(&iter);
 170                                 return -ENOSYS;
 171                         }
 172                         trace_lttng_statedump_block_device(session,
 173                                         part_devt(part), name_buf);
 174                 }
 175                 disk_part_iter_exit(&piter);
 176         }
 177         class_dev_iter_exit(&iter);
 178         return 0;
 179 }
 180
 181 #ifdef CONFIG_INET
 182
 183 static
 184 void lttng_enumerate_device(struct lttng_session *session,
 185                 struct net_device *dev)
 186 {
 187         struct in_device *in_dev;
 188         struct in_ifaddr *ifa;
 189
 190         if (dev->flags & IFF_UP) {
 191                 in_dev = in_dev_get(dev);
 192                 if (in_dev) {
 193                         for (ifa = in_dev->ifa_list; ifa != NULL;
 194                              ifa = ifa->ifa_next) {
 195                                 trace_lttng_statedump_network_interface(
 196                                         session, dev, ifa);
 197                         }
 198                         in_dev_put(in_dev);
 199                 }
 200         } else {
 201                 trace_lttng_statedump_network_interface(
 202                         session, dev, NULL);
 203         }
 204 }
 205
 206 static
 207 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 208 {
 209         struct net_device *dev;
 210
 211         read_lock(&dev_base_lock);
 212         for_each_netdev(&init_net, dev)
 213                 lttng_enumerate_device(session, dev);
 214         read_unlock(&dev_base_lock);
 215
 216         return 0;
 217 }
 218 #else /* CONFIG_INET */
 219 static inline
 220 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 221 {
 222         return 0;
 223 }
 224 #endif /* CONFIG_INET */
 225
 226 static
 227 int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
 228 {
 229         const struct lttng_fd_ctx *ctx = p;
 230         const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
 231         unsigned int flags = file->f_flags;
 232         struct fdtable *fdt;
 233
 234         /*
 235          * We don't expose kernel internal flags, only userspace-visible
 236          * flags.
 237          */
 238         flags &= ~FMODE_NONOTIFY;
 239         fdt = files_fdtable(ctx->files);
 240         /*
 241          * We need to check here again whether fd is within the fdt
 242          * max_fds range, because we might be seeing a different
 243          * files_fdtable() than iterate_fd(), assuming only RCU is
 244          * protecting the read. In reality, iterate_fd() holds
 245          * file_lock, which should ensure the fdt does not change while
 246          * the lock is taken, but we are not aware whether this is
 247          * guaranteed or not, so play safe.
 248          */
 249         if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt))
 250                 flags |= O_CLOEXEC;
 251         if (IS_ERR(s)) {
 252                 struct dentry *dentry = file->f_path.dentry;
 253
 254                 /* Make sure we give at least some info */
 255                 spin_lock(&dentry->d_lock);
 256                 trace_lttng_statedump_file_descriptor(ctx->session,
 257                         ctx->files, fd, dentry->d_name.name, flags,
 258                         file->f_mode);
 259                 spin_unlock(&dentry->d_lock);
 260                 goto end;
 261         }
 262         trace_lttng_statedump_file_descriptor(ctx->session,
 263                 ctx->files, fd, s, flags, file->f_mode);
 264 end:
 265         return 0;
 266 }
 267
 268 /* Called with task lock held. */
 269 static
 270 void lttng_enumerate_files(struct lttng_session *session,
 271                 struct files_struct *files,
 272                 char *tmp)
 273 {
 274         struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, };
 275
 276         lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx);
 277 }
 278
 279 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
 280 static
 281 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 282 {
 283         int cpu;
 284         const cpumask_t *cpumask = cpu_possible_mask;
 285
 286         for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids;
 287                         cpu = cpumask_next(cpu, cpumask)) {
 288                 trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu));
 289         }
 290
 291         return 0;
 292 }
 293 #else
 294 static
 295 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 296 {
 297         return 0;
 298 }
 299 #endif
 300
 301 #if 0
 302 /*
 303  * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
 304  * (scheduling in atomic). Normally, the tasklist lock protects this kind of
 305  * iteration, but it is not exported to modules.
 306  */
 307 static
 308 void lttng_enumerate_task_vm_maps(struct lttng_session *session,
 309                 struct task_struct *p)
 310 {
 311         struct mm_struct *mm;
 312         struct vm_area_struct *map;
 313         unsigned long ino;
 314
 315         /* get_task_mm does a task_lock... */
 316         mm = get_task_mm(p);
 317         if (!mm)
 318                 return;
 319
 320         map = mm->mmap;
 321         if (map) {
 322                 down_read(&mm->mmap_sem);
 323                 while (map) {
 324                         if (map->vm_file)
 325                                 ino = map->vm_file->lttng_f_dentry->d_inode->i_ino;
 326                         else
 327                                 ino = 0;
 328                         trace_lttng_statedump_vm_map(session, p, map, ino);
 329                         map = map->vm_next;
 330                 }
 331                 up_read(&mm->mmap_sem);
 332         }
 333         mmput(mm);
 334 }
 335
 336 static
 337 int lttng_enumerate_vm_maps(struct lttng_session *session)
 338 {
 339         struct task_struct *p;
 340
 341         rcu_read_lock();
 342         for_each_process(p)
 343                 lttng_enumerate_task_vm_maps(session, p);
 344         rcu_read_unlock();
 345         return 0;
 346 }
 347 #endif
 348
 349 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 350
 351 static
 352 int lttng_list_interrupts(struct lttng_session *session)
 353 {
 354         unsigned int irq;
 355         unsigned long flags = 0;
 356         struct irq_desc *desc;
 357
 358 #define irq_to_desc     wrapper_irq_to_desc
 359         /* needs irq_desc */
 360         for_each_irq_desc(irq, desc) {
 361                 struct irqaction *action;
 362                 const char *irq_chip_name =
 363                         irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
 364
 365                 local_irq_save(flags);
 366                 raw_spin_lock(&desc->lock);
 367                 for (action = desc->action; action; action = action->next) {
 368                         trace_lttng_statedump_interrupt(session,
 369                                 irq, irq_chip_name, action);
 370                 }
 371                 raw_spin_unlock(&desc->lock);
 372                 local_irq_restore(flags);
 373         }
 374         return 0;
 375 #undef irq_to_desc
 376 }
 377 #else
 378 static inline
 379 int lttng_list_interrupts(struct lttng_session *session)
 380 {
 381         return 0;
 382 }
 383 #endif
 384
 385 /*
 386  * Statedump the task's namespaces using the proc filesystem inode number as
 387  * the unique identifier. The user and pid ns are nested and will be dumped
 388  * recursively.
 389  *
 390  * Called with task lock held.
 391  */
 392 static
 393 void lttng_statedump_process_ns(struct lttng_session *session,
 394                 struct task_struct *p,
 395                 enum lttng_thread_type type,
 396                 enum lttng_execution_mode mode,
 397                 enum lttng_execution_submode submode,
 398                 enum lttng_process_status status)
 399 {
 400         struct nsproxy *proxy;
 401         struct pid_namespace *pid_ns;
 402         struct user_namespace *user_ns;
 403
 404         /*
 405          * The pid and user namespaces are special, they are nested and
 406          * accessed with specific functions instead of the nsproxy struct
 407          * like the other namespaces.
 408          */
 409         pid_ns = task_active_pid_ns(p);
 410         do {
 411                 trace_lttng_statedump_process_pid_ns(session, p, pid_ns);
 412                 pid_ns = pid_ns ? pid_ns->parent : NULL;
 413         } while (pid_ns);
 414
 415
 416         user_ns = task_cred_xxx(p, user_ns);
 417         do {
 418                 trace_lttng_statedump_process_user_ns(session, p, user_ns);
 419                 /*
 420                  * trace_lttng_statedump_process_user_ns() internally
 421                  * checks whether user_ns is NULL. While this does not
 422                  * appear to be a possible return value for
 423                  * task_cred_xxx(), err on the safe side and check
 424                  * for NULL here as well to be consistent with the
 425                  * paranoid behavior of
 426                  * trace_lttng_statedump_process_user_ns().
 427                  */
 428                 user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL;
 429         } while (user_ns);
 430
 431         /*
 432          * Back and forth on locking strategy within Linux upstream for nsproxy.
 433          * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
 434          * "namespaces: Use task_lock and not rcu to protect nsproxy"
 435          * for details.
 436          */
 437 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 438                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 439                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 440                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 441         proxy = p->nsproxy;
 442 #else
 443         rcu_read_lock();
 444         proxy = task_nsproxy(p);
 445 #endif
 446         if (proxy) {
 447 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
 448                 trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns);
 449 #endif
 450                 trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns);
 451 #ifndef LTTNG_MNT_NS_MISSING_HEADER
 452                 trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns);
 453 #endif
 454                 trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns);
 455                 trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns);
 456         }
 457 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 458                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 459                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 460                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 461         /* (nothing) */
 462 #else
 463         rcu_read_unlock();
 464 #endif
 465 }
 466
 467 static
 468 int lttng_enumerate_process_states(struct lttng_session *session)
 469 {
 470         struct task_struct *g, *p;
 471         char *tmp;
 472
 473         tmp = (char *) __get_free_page(GFP_KERNEL);
 474         if (!tmp)
 475                 return -ENOMEM;
 476
 477         rcu_read_lock();
 478         for_each_process(g) {
 479                 struct files_struct *prev_files = NULL;
 480
 481                 p = g;
 482                 do {
 483                         enum lttng_execution_mode mode =
 484                                 LTTNG_MODE_UNKNOWN;
 485                         enum lttng_execution_submode submode =
 486                                 LTTNG_UNKNOWN;
 487                         enum lttng_process_status status;
 488                         enum lttng_thread_type type;
 489                         struct files_struct *files;
 490
 491                         task_lock(p);
 492                         if (p->exit_state == EXIT_ZOMBIE)
 493                                 status = LTTNG_ZOMBIE;
 494                         else if (p->exit_state == EXIT_DEAD)
 495                                 status = LTTNG_DEAD;
 496                         else if (p->state == TASK_RUNNING) {
 497                                 /* Is this a forked child that has not run yet? */
 498                                 if (list_empty(&p->rt.run_list))
 499                                         status = LTTNG_WAIT_FORK;
 500                                 else
 501                                         /*
 502                                          * All tasks are considered as wait_cpu;
 503                                          * the viewer will sort out if the task
 504                                          * was really running at this time.
 505                                          */
 506                                         status = LTTNG_WAIT_CPU;
 507                         } else if (p->state &
 508                                 (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) {
 509                                 /* Task is waiting for something to complete */
 510                                 status = LTTNG_WAIT;
 511                         } else
 512                                 status = LTTNG_UNNAMED;
 513                         submode = LTTNG_NONE;
 514
 515                         /*
 516                          * Verification of t->mm is to filter out kernel
 517                          * threads; Viewer will further filter out if a
 518                          * user-space thread was in syscall mode or not.
 519                          */
 520                         if (p->mm)
 521                                 type = LTTNG_USER_THREAD;
 522                         else
 523                                 type = LTTNG_KERNEL_THREAD;
 524                         files = p->files;
 525
 526                         trace_lttng_statedump_process_state(session,
 527                                 p, type, mode, submode, status, files);
 528                         lttng_statedump_process_ns(session,
 529                                 p, type, mode, submode, status);
 530                         /*
 531                          * As an optimisation for the common case, do not
 532                          * repeat information for the same files_struct in
 533                          * two consecutive threads. This is the common case
 534                          * for threads sharing the same fd table. RCU guarantees
 535                          * that the same files_struct pointer is not re-used
 536                          * throughout processes/threads iteration.
 537                          */
 538                         if (files && files != prev_files) {
 539                                 lttng_enumerate_files(session, files, tmp);
 540                                 prev_files = files;
 541                         }
 542                         task_unlock(p);
 543                 } while_each_thread(g, p);
 544         }
 545         rcu_read_unlock();
 546
 547         free_page((unsigned long) tmp);
 548
 549         return 0;
 550 }
 551
 552 static
 553 void lttng_statedump_work_func(struct work_struct *work)
 554 {
 555         if (atomic_dec_and_test(&kernel_threads_to_run))
 556                 /* If we are the last thread, wake up do_lttng_statedump */
 557                 wake_up(&statedump_wq);
 558 }
 559
 560 static
 561 int do_lttng_statedump(struct lttng_session *session)
 562 {
 563         int cpu, ret;
 564
 565         trace_lttng_statedump_start(session);
 566         ret = lttng_enumerate_process_states(session);
 567         if (ret)
 568                 return ret;
 569         /*
 570          * FIXME
 571          * ret = lttng_enumerate_vm_maps(session);
 572          * if (ret)
 573          *      return ret;
 574          */
 575         ret = lttng_list_interrupts(session);
 576         if (ret)
 577                 return ret;
 578         ret = lttng_enumerate_network_ip_interface(session);
 579         if (ret)
 580                 return ret;
 581         ret = lttng_enumerate_block_devices(session);
 582         switch (ret) {
 583         case 0:
 584                 break;
 585         case -ENOSYS:
 586                 printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
 587                 break;
 588         default:
 589                 return ret;
 590         }
 591         ret = lttng_enumerate_cpu_topology(session);
 592         if (ret)
 593                 return ret;
 594
 595         /* TODO lttng_dump_idt_table(session); */
 596         /* TODO lttng_dump_softirq_vec(session); */
 597         /* TODO lttng_list_modules(session); */
 598         /* TODO lttng_dump_swap_files(session); */
 599
 600         /*
 601          * Fire off a work queue on each CPU. Their sole purpose in life
 602          * is to guarantee that each CPU has been in a state where is was in
 603          * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
 604          */
 605         get_online_cpus();
 606         atomic_set(&kernel_threads_to_run, num_online_cpus());
 607         for_each_online_cpu(cpu) {
 608                 INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func);
 609                 schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
 610         }
 611         /* Wait for all threads to run */
 612         __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
 613         put_online_cpus();
 614         /* Our work is done */
 615         trace_lttng_statedump_end(session);
 616         return 0;
 617 }
 618
 619 /*
 620  * Called with session mutex held.
 621  */
 622 int lttng_statedump_start(struct lttng_session *session)
 623 {
 624         return do_lttng_statedump(session);
 625 }
 626 EXPORT_SYMBOL_GPL(lttng_statedump_start);
 627
 628 static
 629 int __init lttng_statedump_init(void)
 630 {
 631         /*
 632          * Allow module to load even if the fixup cannot be done. This
 633          * will allow seemless transition when the underlying issue fix
 634          * is merged into the Linux kernel, and when tracepoint.c
 635          * "tracepoint_module_notify" is turned into a static function.
 636          */
 637         (void) wrapper_lttng_fixup_sig(THIS_MODULE);
 638         return 0;
 639 }
 640
 641 module_init(lttng_statedump_init);
 642
 643 static
 644 void __exit lttng_statedump_exit(void)
 645 {
 646 }
 647
 648 module_exit(lttng_statedump_exit);
 649
 650 MODULE_LICENSE("GPL and additional rights");
 651 MODULE_AUTHOR("Jean-Hugues Deschenes");
 652 MODULE_DESCRIPTION("LTTng statedump provider");
 653 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
 654         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
 655         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
 656         LTTNG_MODULES_EXTRAVERSION);